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 be that, if the jury only knew the scanty means the witness has had for obtaining a correct and certain knowledge of the very facts to which he has sworn so glibly, aided by the adroit questioning of the opposing counsel, this in itself would go far toward weakening the effect of his testimony. It may appear, on the other hand, that the witness had the best possible opportunity to observe the facts he speaks of, but had not the intelligence to observe these facts correctly. Two people may witness the same occurrence and yet take away with them an entirely different impression of it; but each, when called to the witness stand, may be willing to swear to that impression as a fact. Obviously, both accounts of the same transaction cannot be true; whose impressions were wrong? Which had the better opportunity to see? Which had the keener power of perception? All this we may very properly term the matter of our cross-examination.

It is one thing to have the opportunity of observation, or even the intelligence to observe correctly, but it is still another to be able to retain accurately, for any length of time, what we have once seen or heard, and what is perhaps more difficult still—to be able to describe it intelligibly. Many witnesses have seen one part of a transaction and heard about another part, and later on become confused in their own minds, or perhaps only in their modes of expression, as to what they have seen themselves and what they have heard from others. All witnesses are